Perhaps you should try some spelling variations:
communication communications » communication communication, communication communicating, communications communication
communications basic » communications based, communications banking, communications a
basic dimensions » based dimension, pacific dimensions, design dimensions
aec file » a file, sdc file
spl file » spss file, san file, sdc file
ip file » ii file, p file, p2p file

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: communication communications basic dimensions ((aec file) or (((spl file) or (ip file))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: communication communications basic dimensions ((aec file) OR (((spl file) OR (ip file)))).
• Adding a wildcard symbol may retrieve word variants: communication communications basic dimensions ((aec file) or (((spl file) or (ip file))))*.